Low Open-Circuit Voltage (Vrd) Switch Mode; Stick Start Procedure − Scratch Start Technique - Miller PipePro Series Owner's Manual

6-5. Low Open-Circuit Voltage (VRD) Switch Mode

6-6. Stick Start Procedure − Scratch Start Technique
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ON
OFF
1
3
1
The VRD switch can be set for low
open-circuit voltage operation in
Stick mode. When the unit is con-
figured for low open-circuit voltage
operation only a low sensing
voltage (approximately 15 volts
DC) is present between the elec-
trode and workpiece prior to the
electrode touching the workpiece.
1
With Stick selected, start arc as
follows:
1
2
3
Drag electrode across workpiece like
striking a match; lift electrode slightly
after touching work. If arc goes out
electrode was lifted to high. If
electrode sticks to workpiece, use a
quick twist to free it.
VRD Switch On: Normal open-circuit
voltage is
electrode touches workpiece; only a
low sensing voltage is present
2
between electrode and workpiece.
For optimal starting performance, a
good clean contact must be made be-
tween the electrode and workpiece.
Voltage Reducing Device
(VRD) Switch
803 562
Electrode
Workpiece
Arc
not present before
OM-262506 Page 37